Spark plug



Nov, 4 1924. 1,514,209

- s.. HANSEN A SPARK PLUG' Filed Aug. 2e, 1922 mi fige.

HlHlill atroz nu@ Patented Nov. 4, 1924i.

UN-irau STATES 1,514,209 PATENT fOFFICE SVEN HANSEN, OEE' CLEVELAND,OHIO.

srnnn PLUG.

Application filed August 26, 1922. Serial No. 584,486.

breakage of the porcelain insulator due tol expansion and contraction ofthe parts is reduced to a minimum; which prevents the escape of productsof combustion therefrom,

particularly such as might result from the shock of the explosionswithin the engine cylinder; in which undue movement of the parts isreadily and automatically taken up or compensated; and in which unduecompression of the gaskets is avoided, thereby materially prolonging thelife of said gaskets.

Further objects of the invention are in part obvious and in part willappear more in detail hereinafter.

ln the drawing, which represents one suitable embodiment of theinvention, Fig. 1 is an elevation; Fig. 2 is a vertical sectional view;and Figs. 3, 4 and 5 are respectively a' plan, elevation and verticalsectional view of the resilient sleeve member.

Referring to the drawing, 1 represents a metal bushing or shell memberhaving a suitably threaded cylinder engaging end portion 2 and ahexagonal head portion 3, by means of which said shell member may besecured in an opening in the engine cylinder. Said shell member isformed with a bore 4 in the cylinder engaging end por- 40 tion 2 whichmerges into an enlarged bore or chamber 5 in the hexagonal head portion3, forming Ian annular beveled'shoulder 6` 'between said bores.The'outer end of said hexagonal head portion 3 is internally threaded toreceive an annular clamping nut 7 having its lower face beveled,asindicated in Fig. 2. Suitably secured within said shell member, suchas by the clamping nut 7, is a porcelain plug or insulator having itstapering end 8 extending into the bore 4 of the cylinder engaging endportion,2` and .itsouter cylindrical end 9 nextending outwardly throughthe clamping nut 7. Said insulator is provided intermediate its endswith an annular enlargement or flange 10,- fitting within the chamber orbore 5, and having its upper edge or shoulder beveled to correspond tothe inclination of the lower face of the clamping nut 7 and its loweredge beveled to correspond to the inclination oi the upper face of theresilient sleeve member, later to be described. An annular gasket 11, ofany suitable yielding material, is preferably interposed between theabutting or engaging faces of the insulator dange 10 Aand the clampingnut 7, to more securely prevent escape or leakage of. the products ot'combustion. Said insulator is'also provided with the usual metal rod 12,the lower end oi' which forms one electrode of the spark plug, the otherbeing formed by a wire 13 suitably secured in the cylinder engagingportion 2 of the shell member.

14 represents the resilient sleeve member, which may be made of anysuitable resilient materiahsuch as hardened steel, and which is adaptedto surround the tapering end 8V of the insulator and seat. in the lowerportion of the chamber within the hexagonal head portion 3 of the shellmember. Said sleeve member is provided with a plurality, two beingshown, of horizontally extendin slots 15, cut from diametrically oppospoints and each extending approximately to the opposite side of thesleeve, thereby obtaining great resiliency. Said slots may be cut at anysuitable vertical distances, depending upon the degree of resiliencydesired, the degree of resiliency'also depending, .of course, upon thenumber of said slots and the kind of material of which said sleevemember is made. The upperl and lower faces of said sleeve member arebeveled, to respectively correspond to the inclination of the lowershoulder of the annular insulator flange 10 and the annular shoulder 6of the shell member, gaskets 16 being preferably interposed' betweensaid abutting or engaging shoulders or faces to more effectively preventleakage past the same.

The resiliency of said sleeve member readily permits expansion andcontraction of the parts, so that the liability of breakage `of theporcelain insulator or other parts isI negligible. Sai-d resilientsleeve member also holds said insulator in place against "the clampingnut 7, or the gasket interposed therebetween so that any undue movementof the parts, such as might resultfrom compression of the gaskets, etc.,is readily taken up or compensated by said sleeve member. It isy to beAunderstood that the essential quality or characteristic possessed by thesleeve member 14 is that of resiliency, as opposed to "a `mere yieldingquality, which is possessed by the annular gaskets. Leak# age or escapeof the products of combustion from the spark plu is also prevented.

Other objects of t e invention will be ap-v parent to those skilled inthe art to which it relates. l

A spark plug, comprising ashell memberv provided With an internalshoulder, an insulator member arranged Within said shell member andprovided with an external shoulder in opposed relation to the shoulderof said shell member, a cylindrical resilient sleeve member surroundingsaid insulator member and arranged between said opposed shoulders, saidresilient sleeve member being provided with plane end surfaces and withoppositely arranged laterally extendingslots, and a clamping nut formoving said insulator member int-0 engagement with said resilient sleevemember.

In testimony whereof I hereby affix my signature.

SVEN HANSEN.

